Claude Crampes IDEI   université toulouse 1 place anatole france toulouse, 31042 france   crampes@cict.fr   http://www.idei.fr   Biographical Sketch: Professor of Economics   Primary Research Focus: Economics of Networks, Economics of R&D   JEL Areas: L1 : Market Structure, Firm Strategy, and Market Performance: General L9 : Industry Studies: Transportation and Utilities: General